Desktop or mobile?
I’ve recently started using Floorp and I like it a lot. It’s a Firefox fork with more customization options and improved privacy (though not to the level of Librewolf). I don’t remember if it has the button you want to remove since I’ve never used that feature or cared about it.
Assuming you mean legally, the best options are Paramount+ (or whichever service it’s on outside the US) or on Blu-ray. None of the television series are available in 4K to my knowledge, but the movies are.